ARRAS MAXEI OIL TREATMENT

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1 I BETH09GB_E page 1/6 SUMMARY: Principle of operation 2 Main characteristics 2 Components of the plant 2 Description of the plant 3 Flow diagram 4 Options 5 TECHNICAL DESCRIPTION OF THE OIL TREATMENT PLANT MEANT TO TREAT LIVE / OPERATING TRANSFORMERS PREAMBLE ARRAS MAXEI plant has been especially designed to carry out the operations of filtration, dehydration and absorption of dissolved gases on a transformer that is under current or operating. Then, the transformer is totally available during the treatment operations that are necessary for its efficient and safe operation. Furthermore, the transformer does not need to be stopped at all during connection with the plant if the security distance between the transformer s connections and the terminals can be respected. ARRAS MAXEI plant has been designed to treat dielectric oil with a 50 ppm moisture content and a dissolved gas The efficient and reliable use of dielectric fluids in transformers, circuit breakers and other types of electrical equipments depends upon some of their basic characteristics, which in service may be affected, resulting in reduced operating efficiency of the electrical equipments. In order to act as an insulant, a coolant and an extinguishing medium, dielectric fluids must have some basic properties, and especially a high dielectric strength. Now, in service, the dielectric fluids basic properties may be affected by oxidation, condensation and other contaminants such as dissolved gases and solid impurities. Working on the principles of filtration, dehydration, and vacuum degasification, ARRAS MAXEI OIL TREATMENT TYPE MAXEI Industries Electriques oil treatment plants are particularly recommended to maintain, dry and fill your transformers and circuit- breakers. By removing solid impurities, dissolved moisture and gases from insulating and cooling oils, they indeed enable to restore the oil dielectric properties, and thus to extend the useful life of your electrical equipment. Used and reknowned all over the world for their performance, reliability and ease of operation, our standard plants have been enriched with the latest technological achievements in order to develop a complete range of plants meant to treat live / operating transformers. As their operation principle has been approved further to content of approx. 10% by volume before being treated. Once the optimal treatment conditions have been reached, the clean treated oil goes out after 1 pass at a maximum temperature of 70 C with a moisture content below 5 ppm* and a dissolved gas content of approximately 0.1% by volume*. This restores the oil dielectric strength to a value in excess of 75 kv 90 after treatment. An oil at 20 ppm will go 80 out at 3 ppm* after 1 pass. These characteristics are given for a distillation curve 70 of mbar at 80 C. For a treatment 50 of the active parts of transformer, these 40 data can vary in function of the state of 30 the transformer. Type of transformer to be treated Up to 220 kv Max. oil quantity litres tests performed in our Quality and Control platform, ARRAS MAXEI treatment plants meant to treat live / operating transformers ensure a reliable and safe treatment of the transformer. Available with various automation levels, the MAS 4000 TEC and MAS 2000 TEC plants can operate not only on live / operating transformers, but also on nonenergized transformers either for their filling-up or for their traditional mainte- on a skid Treatment of live / operating transformers with Comparison betwenn vapor and liquid phases of moisture and dielectric oil ,1 1 0,01 WATER OIL T C C et % d'eau mbars Régulation de température Température en entrée Température en sortie 14:33:15 14:49:50 15:06:30 15:23:10 15:39:50 15:56:30 16:13:10 16:29:50 16:46:30 17:03:10 17:19:50 17:36:30 vide Teneur en eau 1 000,00 100,00 10,00 1,00 0,10

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3 I BETH09GB_E page 2/6 ARRAS MAXEI OIL TREATMENT Principle of operation Options Low speed trailer Road trailer The pre-filtered dielectric fluid enters the plant through an inlet strainer, and then passes through an inlet oil pump and into an oil heater, where it is heated by immersion heaters. After a first filtration 7 µm absolute through cartridge filter, the dielectric fluid is sprayed into a vacuum chamber on a basket of degassing rings. Finally, after elimination of the air bubbles and filtration 1µm absolute, the clean treated fluid flows through the outlet oil pump. Main characteristics Nominal flow* during treatment (l/hr) Options Tarpaulin Metallic cover Heating power (kw) 78 Total power (kw) 88 Filtration** by cartridge in absolute µm 0,5 Limit vacuum against closed suction (mbar) 0.08 Vacuum during treatment (mbar) 0.5 to 2 * : Approximate value. ** : Consumable cartridge with filtration expressed in absolute µm at 99.9 %. Our plants are all equipped with tropicalized electrical material Power supply 400 Volts 3 phases 50 Hz Auxiliary operation in 220 Volts by transformer. Components of the plant Options Remote control Continuous moisture content measurement Digital recorder - 1 Inlet oil motor-pump. - 1 Direct electrical heater. - 2 Cartridge filters 6µ absolute. - 1 Dehydration tank. - 1 Outlet oil vacuum motor-pump. - 1 Trap system of free gases. - 1 Cartridge filter 1µ absolute. - 1 Single-staged vacuum motor-pump. - 1 Set measuring, controlling, alarming and regulating apparatus. - 1 Control panel with display and PLC. - 1 Set pipes, valves and accessories for the connection of the plant to the transformer. - 1 Set of 6 hoses with flanges (5 hoses 40, length : 10 m and 1 hose 40, length : 2 m ). In standard presentation, the oil treatment plant is installed on a section iron plate with retention tray and maintenance wheels.

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5 I BETH09GB_E page 3/6 ARRAS MAXEI OIL TREATMENT Inlet oil pump Maximum flow of pump in l/hr 7000 Pump type Centrifugal Discharge rate in mce 55 Motor power in kw 2.2 Rotation speed in rpm 1500 Pump construction Cast iron/steel Connection diameter in mm 40 Oil heating Total heating power in kw 78 Number of thermo-dippers 10 Power of an element in kw 7.8 Auxiliary heating diameter 40 Filtration 6µm absolute Number of cartridges per filter 6 Number of filters 1 Filter construction Cast iron/steel Clogging control Pressostat Filtration 1µm absolute Number of cartridges per filter 1 Filter construction Cast iron/steel Clogging control Pressostat Vacuum pump Flow in m 3 /hr 170 Limit vacuum in mbar 0.08 Motor power in kw 4 Rotation speed in rpm 1450 Oil capacity in litres 5 Vacuum measurement Pirani Auxiliary vacuum connection 50 Outlet oil pump Maximum flow of pump in l/hr 4500 Pump type Centrifugal Discharge rate in mce 40 Motor power in kw 3 Description of the plant Continuous control of the temperature of the plant at oil inlet, before degassing chamber and at oil outlet. Remote control of the overheating through security thermostat. Permanent control of the overpressures in the network thanks to pressostat, security valve and by-pass. Flows display at inlet, before degassing (regulation and minimum flow) and outlet of the plant. Continuous control of the oil levels and condensates in the plant. Continuous control of the oil level in the transformer. Automatic regulation of foaming effects. Tri-filtration through strainer (0.8 mm), filtration before degassing (7µm absolute) and fine filtration (1µm absolute) at outlet. Remote control of filters clogging with pressostat. Vacuum control with Pirani gauge and manometer. Removal of free gases and air bubbles at the outlet of the plant. Detection and automatic draining of free gases at plant outlet. Running of the plant thanks to an operating system. Self-operating in compressed air by compressor. Vacuum accumulator for draining of transformers connections. Secure connections to the transformer. Automated and rationalized starting sequences. Filling of the plant. Piping put under vacuum. Filling of the piping. Treatment in closed circuit. Treatment on transformer. Draining of the piping. Draining of the plant. Vacuum in the accumulator for the pipes draining. Rotation speed in rpm 1500 Pump building Cast iron/bronze Connection diameter in mm 40 Comment : is also equipped with an additive function in order to treat off line transformers, using the MAS TEC safeties. Moreover, you can also use it with the standards safeties used for MAS type treatment plants.

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7 I BETH09GB_E page 4/6 ARRAS MAXEI OIL TREATMENT Control panel ARRAS MAXEI oil treatment plant type is equipped with a watertight panel of industrial type in painted cast iron, with PLC, contactors, relays, terminal boards, and every cables necessary for the plant operation. On the door of the control panel stand the operating desk, the switches and the warning lights of the different components. Painting ARRAS MAXEI oil treatment plant type is painted in white (RAL9002). Approximate dimensions Machine length in mm Width Heigh Total length in mm in mm in mm Plant on a platform with tarpaulin Ø Plant on a platform with metallic Ø cover Plant on a skid with tarpaulin Ø Plant on a skid with metallic cover Ø Weight in kg Plant on a low speed trailer with tarpaulin Plant on a low speed trailer with metallic cover Plant on a road trailer with tarpaulin Plant on a road trailer with metallic cover * * * * 3500 * : Dimension with the draw bar

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9 I BETH09GB_E page 5/6 ARRAS MAXEI OIL TREATMENT Vanne haute transformateur Raccord guillemin anti-desserrement Bague téflon isolante Vanne à ouverture pilotée Tresse conductrice Entrée auxiliaire de remplissage du MAS par fût ou entrée pour traitement traditionnel G3 V23 B3 (JN3) V2 CdC T 1 V28 TS PS1 Mano 4 VP3 CAR3 B5 (JN5) VP12 F1 P1 G2 V3 BP V4 IC B6 (JT6,CI6) V25 B8 (JN8) CH Reg M1 SS1 RAO25 SG NHRT SCD B7 (JN7) VP9 T1 T2 Réserve V20 d'huile VP2 VP10 NBRT VP4 RAO1 V1 M3D G1 B4 (JN4) B2 (JN2) VP8 VP1 PS2 T 2 B1 (JT1,CI1) VP11 F2 CAR1 CAR2 Raccord guillemin anti-desserrement V18 Vanne basse transformateur V17 V16 V19' V19 G4 Contact alarme Contact d'alarme Niveau d'huile buchholz : NO transformateur : NO Filtration 1 µm absolu Nous nous réservons All characteristics le droit de may modifier be modified les caractéristiques without any prior techniques notice. sans préavis V5 M2 P2 Filtration à 6 µm absolu Option : teneur en eau en ligne VP5 V10' ID V8 V10 Mano 1 TE SCAH DEGAZ SCNH SCNB SCAB Sortie auxiliaire de vidange du MAS par fût ou sortie pour traitement traditionnel V15 V15 VP7 RASCH DM V11 PT1 Clap PIR NHCS V15 Niveau d'huile dans gatte du MAS VP6 PV V13 V14' NHG RAO13 ACCU Mano 2 V14

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11 I BETH09GB_E page 6/6 ARRAS MAXEI OIL TREATMENT Options Process controls AUTOMATIC DRAINING OF THE VALVE This option enables an optimal protection of the vacuum net of the plant. VOLTMETER / AMMETER This option will enable you to visualize the power supply of the plant, as well as the strength developed in order to protect the net and equipment. REMOTE CONTROL The remote control enables to be informed of the plant operation through an internal phone line, a TELECOM phone line, or through the GSM network. RECORDER This option enables to record the physical parameters of the degassing process like temperature and vacuum level. CONTINUOUS MOISTURE CONTENT MEASURING This option has been designed to carry out on-line moisture content measurement, that means continuously during the oil treatment. Then you reduce the errors linked to the sampling method and the risks due to hot oil handling. REGENERATION This option enables to regenerate the oil and to decrease its acidity thanks to absorbent and colloidal properties product. Digital recorder GSM remote control Presentations 1) LOW SPEED TRAILER The oil treatment can be installed on a low speed trailer with full tyres (max. speed : 20 km/hr). 2) ROAD TRAILER The oil treatment plant can be installed on a road trailer. The trailer is equipped with rear lights in accordance with the EU regulations of road code. The whole installation is commissioned by the French government vehicle testing service to be allowed to circulate in France and in the European countries. 3) TARPAULIN PROTECTION The plant can be equipped with a protection type tarpaulin, which protects it from bad weather. The tarpaulin can be opened on the four sides thanks to its panels to enable the access to all the components of the plant. 4) METALLIC COVER PROTECTION The plant can be equipped with a metallic cover type protection, which protects it from bad weather. It is made of aluminium and the frame is made of iron steel. The side panels open horizontally, close per key and are maintained thanks to gas jacks. The panels enable the access to the components of the plant. Road trailer with metallic cover Low speed trailer with tarpaulin Skid with tarpaulin

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